The Universe we observe today has been shaped extensively by massive stars. From birth to death and throughout their entire lives, they mold their near and far environment in multiple ways, by driving galactic dynamics, and chemically enriching the interstellar environment through their explosive deaths. In spite of their obvious importance, observational challenges have severely limited our knowledge of massive stars. In particular, their great distances and scarce numbers induce observational challenges to our understanding of their formation and evolution. However, we do know that massive stars
love company. I will present an overview current picture of the multiplicity properties of massive stars and discuss the implications on their formation.